It is approximately 48 kilometers in diameter and was discovered on 28 April 1932 by the South African astronomer Cyril V. Jackson at the Union Observatory in Johannesburg.
The asteroid was named after the large Zambezi Basin in southern Africa

https://en.wikipedia.org/wiki/1242_Zambesia

Cyril V. Jackson (5 December 1903 – February 1988) discovered 72 asteroids and 3 comets, two of which can still be observed today.
58P Jackson-Neujmin & 47P Ashbrook-Jackson.

He was born in Ossett, Yorkshire in England; his father emigrated to South Africa in 1911. He earned his Bachelor of Science (BSc) at the University of the Witwatersrand, Johannesburg.

https://assa.saao.ac.za/sections/history/astronomers/jackson_c/

Some nearby stars reveal themselves by their proper motion over a period of time from approximately 1955 to the present day.

Distance from the Sun (au) : 2,87

Time: 22:03UT 2026-03-05 Exp. 9 x 10sec.
Tel. 0.254m f/5.8 ST-10XME CCD @ -25°C 1.9"/pix
Odd Trondal Obs.code 238 (Uranium). Oslo Norway.